This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 3 |
| 2 | 7 |
| 3 | 23 |
| 4 | 95 |
| 5 | 479 |
| 6 | 2879 |
| 7 | 20159 |
| 8 | 161279 |
| 9 | 1451519 |
| 10 | 14515199 |
| 11 | 159667199 |
| 12 | 1916006399 |
| 13 | 24908083199 |
| 14 | 348713164799 |
| 15 | 5230697471999 |
| 16 | 83691159551999 |
| 17 | 1422749712383999 |
| 18 | 25609494822911999 |
| 19 | 486580401635327999 |